https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77264

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:

#include <string>

int main () {
  std::string str("xyz");
  char c = 'Y';
  str.replace(1, 1, &c, 1);
  if (str[1] != 'Y')
    __builtin_abort();
}

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